Does any one know how to identify between

Juglans Regia, Buccaneer and Broadview

As I have a walnut tree approx 10 years old and 25ft hi with no nuts,
and a friend has one that is only about 20ft hi that was cropping
after 5 years. Mine seems to be more erect and my friends more
spreading.

Which makes me think its a different variety ??